<template>
  <view>
    <view class="search-box">
      <uni-search-bar @input="input"  cancelButton="none" placeholder="搜索" :radius="100" :focus="true">
      	</uni-search-bar>
    </view>
    <!-- 搜索建议列表 -->
    <view class="sugg-list" v-if="searchResults.length !== 0">
      <view class="sugg-item" v-for="(item, i) in searchResults" :key="i" @click="gotoDetail(item.goods_id)">
        <view class="goods-name">{{item.goods_name}}</view>
        <uni-icons type="arrowright" size="16"></uni-icons>
      </view>
    </view>
    <!-- 搜索历史-->
    <view class="history-box" v-else>
      <view class="history-title">
           <text>搜索历史</text>
           <uni-icons type="trash" size="17" @click="clean"></uni-icons>
      </view>
      <!-- 列表区域-->
      <view class="history-list">
        <uni-tag :text=item v-for="(item,i) in histories" :key="i" @click="gotoGoodsList(item)"></uni-tag>
      </view>
    </view>
  </view>
</template>

<script>
  export default {
    data() {
      return {
        // 延时器
        timer:null,
        // 搜索关键字
        kw:'',
        // 搜索的结果列表
        searchResults:[],
        // 搜索关键词的历史记录
        historyList:['a','apple','app']
      }
    },
    computed:{
      histories(){
       return [...this.historyList].reverse()
      }
    },
    onLoad() {
      this.historyList = JSON.parse(uni.getStorageSync('kw') || '[]')
    },
    methods:{
      input(e){
         clearTimeout(this.timer)
        
        this.timer=setTimeout(()=>{
          // 如果500ms之内,没有触发新的输入事件，则为搜索关键字赋值
          this.kw = e
          // console.log(this.kw);
          this.getSearchList()
        },500)
      },
      async getSearchList (){
        if(this.kw.length===0){
          this.searchResults=[]
          return
        }
        const {data:res} = await uni.$http.get('/api/public/v1/goods/qsearch',{query:this.kw})
        if(res.meta.status !== 200) return uni.$showMsg()
        this.searchResults=res.message
        this.saveSearchHistory()
      } ,
      gotoDetail(goods_id) {
        uni.navigateTo({
          // 指定详情页面的 URL 地址，并传递 goods_id 参数
          url: '/subpkg/goods_details/goods_details?goods_id=' + goods_id
        })
      },
      saveSearchHistory(){
        // this.historyList.push(this.kw)
        const set = new Set(this.historyList)
        // console.log(set);
        set.delete(this.kw)
        set.add(this.kw)
        this.historyList = Array.from(set)
        uni.setStorageSync('kw',JSON.stringify(this.historyList))
      },
      clean(){
        this.historyList=[],
        uni.setStorageSync('kw' , '[]')
      },
      gotoGoodsList(kw){
        uni.navigateTo({
          url:'/subpkg/goods_list/goods_list?query='+kw
        })
      }
      },
  }
</script>

<style lang="scss">
.search-box{
  position: sticky;
  top: 0;
  z-index: 999;
}
.sugg-list {
  padding: 0 5px;

  .sugg-item {
    font-size: 12px;
    padding: 13px 0;
    border-bottom: 1px solid #efefef;
    display: flex;
    align-items: center;
    justify-content: space-between;

    .goods-name {
      // 文字不允许换行（单行文本）
      white-space: nowrap;
      // 溢出部分隐藏
      overflow: hidden;
      // 文本溢出后，使用 ... 代替
      text-overflow: ellipsis;
      margin-right: 3px;
    }
  }
}
.history-box{
  padding: 0 5px;
  .history-title{
    display: flex;
    justify-content:space-between;
    height: 40px;
    align-items: center;
    font-size: 13px;
    border-bottom: 1px solid #efefef;
  }
  .history-list{
    margin-top: 5px;
    .uni-tag{
      margin-right: 10px;
      background-color: #efefef;
      color: #000;
      border: none;
      flex-wrap: wrap;
      margin-top: 5px;
    }
  }
}
</style>
